Pespetttal calendar



S. G. MONK.

PERPETUAL CALENDAR.

APPLICATION FILED MAYH, 1920.

Patented Nov. 23, 1920.

INVENTOR:

' T all whom it mag concern:

SIDNEY GORDON.

om n st r ewee m I sinner GC'RDQN MONK, on PLYMOUTH, ENGLAND; "1;

PERPETUAL CALENDAR.

Be it known that I MONK, a subject of the King of England, residing at Plymouth, in the. Kingdom of England, have invented new and usefulImprovements in and Relating to Perpetual Calendars, of which the following isa speci fication. r

Perpetual calendars as now in use are characterized by relatively-movable memhere, either of fabric running over rollers, by rotating disks or by running sliders, having displayed upon them certainselected data, and arranged so that the .juxta-post tion of these movable members in some particular manner shall produce the calendar for any particular month forany particular year. The manner of obtaining this juxta- 1 positionbetween the moving members consists, in general, either of (1) bringing certain exhibited data, 6. 9., years or months, into positions adjacent to one another, the necessary movement bringing about automatically a correspondmg movement of the other data, thus exhibiting the desired calen' dar, or of requiring knowledge, obtained from some external source, of the desired calendar, and merely setting the data provided into that particular form, or of (3) using an auxiliary code, provided with the calendar, by the aid of which the desired setting is accomplished.

My invention described in particular, relates to that system of calculating and indicating dates by means of perpetual calendars wherein certain year numbers,.months, month-dates, and days are arranged on cer- 'tain relatively-movable members so as to cooperate with one another in some particular manner, thereby producing a calendar for any selected month, and more particu larly to that class of calendar that is set by effecting relative adjustment between scales or tables: v

(1) day names (a single set), (2) month names in specific groups.v (3) dates of the month (a double set in prescribed positions), 7

auxiliary code, involving but a simple movement, namely, the bringing together of the month required (on one member), and

The

p s e i ationstat smen. Patented Nov. 23,1920. Apphcation filedMay 11, 1920. Serial 1%. 380,595. r i

the year selected (onanother member) pro..: ducmg finally va calendar of the familiar variety, with the days ofthe week in order,

beginning with Sunday. 7 I

The present invention consists in aparticular combination, and arrangement of parts for thls purposehereinafter described.

:Although the use of running sliders has T been proposed inother forms of perpetual calendar, such forms do notmake use of the particular method of setting herein em-- ployed.

' The invention is illustrated in the accompanying drawings, of which Flgures 1 and 2 represent face plans of the component parts and Fig. 1 represents parts. 4

The invention consists of a facesheet A Fig.1 upon which is set'out a succession of'years as shown a, thesuccession belng capable of extension 1n either d1rect1on, subject only'to the condition that the years be arranged in rows of seven and that a blank space be left immediately preceding every leapyear. Alongside this table of years an opening or Window 7) is out out of the sheet, in order to'displayanother .table on a slide behind (shortly to be described). Against this again is set out the days of the week 0 as shown, F g. 1, beside a second opening or window 62 cut out of the sheet to display another table on the I slide aforementioned.

A slide B, Fig. 2, shall be mounted in i runners behind the face sheet A, Fig. 1, and

.upon this slide shall be set out two tables 6 and f (shortly to be described) and the slide so mounted that these tables are accurately displayed through the windows 6 and (Z respectively in'the face sheet A, Fig. 1. The table 6 above referred to shall comprise the months of the year setout in seven rows and the succession of rows re-- peated as necessary to total 13, as spec1fi-f cally shown. Table f, shall comprise the succession of numbers 1 to 31, arranged in successive order as specifically shown.

W hen the calendar is assembled, with,

' slide B, in position behind face, sheet A, as

defined and shown in section in Fig. 1, and, when slide B, ismoved so that any selected month in table 0, is opposite any selected 7 5' .l v a section through X.Y, of the assembled year in table a, then there Will be displayed, through Window d, the ordinary calendar for that selected month for that selected ample if 1921, be the firstyear initable a Figlil and the January and Octobe1"-column the first in table 6 Fig. 2, such a calendar would give the same reading as the one specifically defined and drawn. The

, inter-relation between the years in table a and the months in table 6 is such that whatever year be selected with which to begin table. a, the column selected to begin table 7 V 6 must bethe one containing the month or months in that year in which the first da falls upon a Saturday.

In table 6 January and February are peated in adjacent columns in a specially distinguished way,1e. 9., by being displayed in special characters or in a special colored ink and these special months are intended for use in leap. years only. The leap years are also distinguished in table a by some special characteristic, 6. 9., lined around in red ink or such like manner. 7

I claim: a p

'18. calendar consisting in a face plate hearing on its front 4: columns of year numbers showing a blank space before the leap year numbers; a Sight aperture next to the num-- ber. columns, a laterally adjoining single day column followed by an adjacent lateral sight aperture, and Vertical runnersapplied to the reariof the face plate in combination with a slide adapted to move vertically in said runners and bearing thirteen rows of months and'thirteen spaced alined rows of day-numbers arranged so as to appear Within said apertures in successive 'alinen'ient withthe year. numbers on the face plate.

' 24th Aprll, 1920. i

SIDNEY GORDON MONK. 

